Well, I may have been wrong about that. The CRU itself made that claim in August, per this quote from The Register: (
Global Warming ate my data • The Register)
The world's source for global temperature record admits it's lost or destroyed all the original data that would allow a third party to construct a global temperature record. The destruction (or loss) of the data comes at a convenient time for the Climatic Research Unit (CRU) in East Anglia - permitting it to snub FoIA requests to see the data.
That's a secondary source but Google will show lots of references to this. Note this was all *before* the release of the emails and was also ignored by most mainstream media. I simply took it at its face and believed the CRU's version. Come to think of it, maybe this is what motivated someone to snatch and publish the emails and source code.
What the emails appear to show is that the data was not lost (unsurprisingly); the CRU was just lying to avoid responding to the FoIA request.
I have not tried to track down the original sources of the above -- not my job!